return new NodeID to avoid fetching it again when add new node to cluster

[greatsharp]

[greatsharp]

[git-hulk]

@greatsharp Would you mind adding a test case for this?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 46.66%. Comparing base (6c56470) to head (88e1305). Report is 69 commits behind head on unstable.

Files with missing lines	Patch %	Lines
store/cluster_shard.go	25.00%	3 Missing :warning:
store/cluster.go	0.00%	2 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable     #307      +/-   ##
============================================
+ Coverage     43.38%   46.66%   +3.27%     
============================================
  Files            37       45       +8     
  Lines          2971     4391    +1420     
============================================
+ Hits           1289     2049     +760     
- Misses         1544     2134     +590     
- Partials        138      208      +70     

Flag	Coverage Δ
unittests	46.66% <37.50%> (+3.27%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• :package: JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[greatsharp]

@greatsharp Would you mind adding a test case for this?

sure, wait for a moment please

[greatsharp]

@greatsharp Would you mind adding a test case for this?

check again